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Where can I find, who makes the best 2001 X5 aftermarket angel eyes headlights that still work with the factory auto leveling system? Where can I find aftermarket angel eye direct replacement fog lamps? What is the best air intake for the X5: the aFe PRO DRY S Cold Air Intake System, aFe MagnumFORCE Pro Dry S Intake, aFe MagnumFORCE Pro 5R Stage 1 Intake or just replace the air filter with a K&N?

Also my passenger side brake light is going in and out and it is not the bulb but the connection. Any suggestions on how to fix this?

For angel eye headlights just check out ebay for Depo headlights like this one.

For the tail lights same thing, get replacement lights.
For the air filter, I just went with the K&N drop in filter. There's an air scoop up front so the stock air silencer is already a good system.
Fog lamps with angel eyes I just leave to the wannabes. I saw a Dodge Charger with those rings in the fog lamps and thought...
Just get the rings around the main lamps like BMW's are made. You could do a xenon upgrade to the fogs, but they would be really bright and would have to be aimed.